Tell us, when will this be, and what will be the sign that all these things are about to be accomplished?”

When they bring you to trial and hand you over, do not worry beforehand about what you are to say, but say whatever is given you at that time, for it is not you who speak but the Holy Spirit

But when you see the desolating sacrilege set up where it ought not to be (let the reader understand), then those in Judea must flee to the mountains

Pray that it may not be in winter.

And if the Lord had not cut short those days, no one would be saved, but for the sake of the elect, whom he chose, he has cut short those days. 21 And if anyone says to you at that time, ‘Look! Here is the Messiah!’[c] or ‘Look! There he is!’—do not believe it. 22 False messiahs[d] and false prophets will appear and produce signs and wonders, to lead astray, if possible, the elect. 23 But be alert; I have already told you everything.

Truly I tell you, this generation will not pass away until all these things have taken place.

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But about that day or hour no one knows, neither the angels in heaven nor the Son, but only the Father. 33 Beware, keep alert,[
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The “when ” and “sign” question seems to have been answered, what need was there to add the exact day and hour?